Guiding device for tool machines



May 12, 1953 J, BECH 2,638,387

GUIDING DEVICE FOR TOOL MACHINES Filed July 26, 1947 2 Sheets-Sheet 1 IN V HV TOR.

J. BECH GUIDING DEVICE FOR TOOL MACHINES May 12, 1953 2 Sheets-Sheet 2 Filed July 26, 1947 INVENTOR.

Patented May 12, 1953 UNITED I I 2,638,387 GUIDING DEVICE FOR TOOL, MACHINES Jrgen Bech, Lyngb y', Denmark Application July 26, 1947, Serial No. 763,915

In Denmark-October5, 1943 Section 1, Public Law 690, August8, 1946 Patent expires October 1963 3 Claims.

The present invention relates to a guiding device for tool machines that are provided with a guide rodsupporting the cutter head of the machine, and a casing encompassing this guide rod, said casing and guide rod being relatively displaceable. v

The hitherto known guiding devices of this kind aresubjected to the essential drawback that the guide rod contacts the interior wall of the case with its entire surface. To reduce the resulting friction and thus provide increased mobility, comparatively large quantities'of a lubricant must be applied to the casing and guiding rod, ,but nothwithstanding this lubrication the mobility acquired will not always be sufficient to meet the demands of finer work, because a small displacement of the one member in relation to the other will take place in jerks, which render impossible the accomplishment of fine work.

The object of the presentinvention is to provide means for remedying this drawback, thus rendering possible the accomplishment of smooth running of the casing and the guide rod relatively. This is obtained by the introduction between the casing and the guide rod of a number of rollers which in two planes at a right angle to each other are arranged on opposing sides of the guide rod, and of which rollers that or those disposed on the one side of the guide rod is or are adjustable.

By these means the friction between the relatively movable members is reduced to a minimum, and the friction pressure between the rollers and the guide rod may be adjusted to any desired value. Thecontinued lubrication of the relatively movable members is avoided, and owing to the presence of the rollers any mutual displacement of the members may be performed smoothly.

In a preferred manner of construction the casing carries on two adjoining sides a number of rollers, and on each of the opposing sides a radially adjustable roller disposed midways in relation to the former rollers. By means of this construction a comparatively simple manner of regulation of the adjustable roller is obtained.

The invention is furthermore explained in the following description with reference to the accompanying drawing, in which one embodiment of the invention is illustrated.

Fig. 1 is a top elevation of a guiding device according to the invention as applied to a milling machine of which only parts pertinent to the invention are included,

Fig.4 a sectional view on line IV--IVin Fig. 2 a side elevation of the device shown in:

Fig. 1, I

.Fig. 3 a sectional view on line III-III in Fig. l on a somewhat-increased scale, and

Fig.3.

Referring tothe drawing, I indicates the guide rod'of the milling machine, which guide rod carries the cutter head (not shown), and Zindicates acasing accommodating the guide rod I, within which casing the guide rod is lengthwise displacable but not rotatable. The casing is rigidly attached to the machine frame, and the casingand guide rod have square cross section. To each of two adjoining walls of the casing there are applied interspaced casings 3 and ,4, and 5 and 6 respectively, each pair of casings carrying a non adjustable roller 1 and 8 respectively. Toeach of the walls opposed to the first mentioned walls of the casingmidways between the rollers I and 8 is'attached a single pair of casings, 9 and II) respectively, each pair carrying a radially adjustable roller, l I and I2 respectively.

As shown in Figs. 3 and 4, the casing 9 has a shaft I3 extending transversely to the casing 2,

I and within the casing carries a bushing I4 that accompany it in this rotational movement. The

groove I6 extends to the ends of the shaft thus allowing the extraction of this shaft from the bushing.

Each end of the bushing I4 is turned down to form uniform eccentric paths I8 for the ball bearings I9 that are provided with an exterior ring 20. When the bushing I4 with its eccentric paths I8 is rotated by means of the shaft I3, the ball bearings and with them the exterior ring 20 will alter their position in relation to the shaft, and upon completion of each adjustment of the exterior ring 20 upon the shaft, the latter is gllamped in position by means of a clamping nut The adjustable roller in the bearing I0 is constructed in a corresponding manner.

It will be understood that the invention described above can equally well be applied to a machine in which the guide rod is rigidly attached to the machine frame, and the casing is movable in relation to the guide rod. Furthermore, more than two non-adjustable rollers may be applied to the two adjoining sides, as likewise on the opposing sides may be applied adjustable rollers corresponding in number to the intervals between the non-adjustable rollers. The means for adjustment of the rollers may b others than those described and illustrated, as likewise the driver member-:.between. the shaft. and the bushing may be arranged many other adequate manner.

The guide rod may furthermore have othercross section than square. It may for instance be triangular or polygonal in cross section. Noris it necessary to interpose ball bearingsv between;

the eccentric paths on the bushing and the cylindrical roller, as these members may. contacteach other directly. Instead of eccentric bearings-=at each end of the bushing, this membermaybe provided with a single, or with several eccentric:

bearings in any part between its ends.

I claim:

1. A guiding device for tool machines comprising a.'cutter.=head.guidin'gerod of angular cross section, and a casing surrounding said rod,. said' other'pair ofrollerseach bearing phone of the othertwoadjoining-sides of the said guiding rod."

2. A guidingdevice for-tool machines comprising'a cutter head guiding rod of= angular cross section,- and a casing;surrounding said rod, said rod and said casing being relatively 'displaceable longitudinally with: respect to each. other, two

relatively interspacedipairs of rollers mountedon.v axles rigidly secured in the said'casing, one roller.

of each pair bearing on one side of the said-guiding bar. the other roller of each pair bearing on an adjoining side of the guiding bar, another pair of rollers spaced from the aforesaid two pairs of rollers, each roller bearing upon one of the other two adjoining sides of the said guiding rod, an axle foreach :roller in the last-mentionedrpair of rollers eccentricall-y mounted in :the: casing for adjustment of the said rollers in relation to the guiding rod.

3. A guiding device for tool machine comprising-a cutterhead" guiding rod of angular cross section, and a casing surrounding said rod, said rod and said casing being relatively displaceable longitudinally --with respect to each other, two

- relativelyinterspaced pairs of rollers mounted on axles-rigidly. secured in the said casing, one roller of each pair-bearing on one side of the said guiding bar, the other roller of each pair bearing on anadjoining side of the guiding bar. another pair of rollers spaced from the aforesaid two pairs :of rollers, 8501121301181 bearingiuponx one of the other two adjoining; sides- Of="thet said guide rod; anaxle for :each: said :other :rollers: having an' eccentric bore, a bolt.- extending; longitudinally through. said :bore for securing said aXlEr in said casing, and means for preventing rotationaof said bolt'and said axle relative to each other,abut'permitting: longitudinal. displacement: of .said :bolt in said bore.

J QRGEN BECH..

References Cited:--in the r file; of this i patent UNITED STATES PATENTS Number Name. Date.

636,647] Eisenhuth Nov. '7, 1899 1,855,528 Onsrud Apr.,26, 1932. 1,982,287 Einstein Nov. 27, 1934. 2,312,804- Derrick Mar..2, 1943 FOREIGN PATENTS Number Country. Date 129,916 GreattBritain 1919 

